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NTAP-20210326-0004 — CVE-2021-23336 Python Vulnerability in NetApp Products

Published 2021-03-26 · Updated 2024-05-01 · Status: Final · Exploitation: Public · Severity: MEDIUM 5.9 · ONTAP affected: Yes

Official advisory: NTAP-20210326-0004 on security.netapp.com ↗. Affected versions, fixed releases, and workarounds live there — this page is a summary.

Product family: Cloud Backup / AltaVault / SteelStore · ONTAP · SnapCenter | ONTAP-relevant | highest CVSS: 5.9

CVEs in this advisory

CVE-2021-23336 — MEDIUM · CVSS 5.9 · site index

What the CVE records say

CVE-2021-23336 — The package python/cpython from 0 and before 3.6.13, from 3.7.0 and before 3.7.10, from 3.8.0 and before 3.8.8, from 3.9.0 and before 3.9.2 are vulnerable to Web Cache Poisoning via urllib.parse.parse_qsl and urllib.parse.parse_qs by using a vector called parameter cloaking. When the attacker can separate query parameters using a semicolon (;), they can cause a difference in the interpretation of the request between the proxy (running with default configuration) and the server. This can result in malicious requests being cached as completely safe ones, as the proxy would usually not see the semicolon as a separator, and therefore would not include it in a cache key of an unkeyed parameter.

Impact

Successful exploitation of this vulnerability could lead to addition or modification of data or Denial of Service (DoS).

Affected products

NetApp Cloud Backup (formerly AltaVault)
ONTAP Select Deploy administration utility
SnapCenter

Official fixes

ONTAP Select Deploy administration utility — vendor fix ↗
SnapCenter — vendor fix ↗

What to do

Check the affected products listed above against the official advisory's affected-versions table — that is where the exact ONTAP 9 release, ONTAP tool, or management product versions are named.
If affected and a fixed release exists, plan the upgrade — see the ONTAP upgrade runbook.
If exploitation is listed as "active", treat remediation as urgent and review exposure (management LIFs, ONTAP S3, SnapMirror endpoints).
Harden in parallel: security hardening baseline and ransomware protection on ONTAP.